Rob Peter to pay Paul with this nifty accessory...

Jun 21, 2015
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#4
Why not just buy a power bank? It may be useful for using a friends battery once in a blue moon, can't see it being too popular though.
 

Rafagon

Genius
Gold
Dec 7, 2011
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Miami, Florida
#5
Draining a devices battery to charge another? Sounds like an awful idea to me.
What dire emergency would necessitate this?
Why not just buy a power bank? It may be useful for using a friends battery once in a blue moon, can't see it being too popular though.
It is far from optimal. It's just a last resort. Maybe you and a friend are out canyoneering one day, you both slip and fall, and a boulder falls and pins both of you against a wall. He or she has a crappy phone that cannot get a signal but which happens to have a lot of battery power left, and you have an iPhone 6s Plus with no battery power left. You could charge your battery from theirs and make the phone call that saves the day.

The thing is only $11, but it might save your life.